#include <iostream>

namespace Y190606_SandClock {
int main();


int main() {
	int N;
	char tag;
	std::cin >> N;
	std::cin >> tag;
	int n2 = N / 2;

	for (int i = 0; i < n2; ++i)
	{
		for (int k = 0; k < i; ++i)
			std::cout << ' ';

	}

	return 0;
}

}

int main_Y190606_SandClock() {
	return Y190606_SandClock::main();
}